N.C. Horse Owners Urged to Vaccinate against WNV, EEE

Both WNV and EEE are endemic across North Carolina and can cause illness or death, but the risk of horses contracting the diseases can be lessened with a sequence of two vaccines.

Photo: Erica Larson, News Editor

It’s mosquito season and it’s time for horse owners across North Carolina to talk to their veterinarians about protecting their animals from mosquito-borne diseases. West Nile virus (WNV) and Eastern equine encephalomyelitis (EEE) are endemic across North Carolina and can cause illness or death, but the risk of horses contracting the diseases can be lessened with a sequence of two vaccines.

In 2012, there were 20 confirmed cases of EEE and three cases of WNV in North Carolina horses reported, but state officials say they expect up to four unreported cases for each one confirmed, making the possible impact much larger.

“North Carolina has an extended mosquito breeding period, so every horse owner should talk to their veterinarian about how to protect their animal year-round,” said State Veterinarian David Marshall, DVM. “In addition to getting animals vaccinated, everyone needs to be extra vigilant now to reduce the breeding grounds for mosquitoes. Take the time now to rid your yard and pasture of any standing water to reduce the risk.”

The EEE and WNV vaccinations initially require two shots, three to four weeks apart, for horses, mules, and donkeys that have no prior vaccination history. Neither vaccination fully protects the animal until several weeks after the second shot, so it is best to vaccinate as early in the mosquito season as possible.

Clinical signs of WNV in horses can include loss of appetite and depression, fever, weakness or paralysis of hind limbs, convulsions, impaired vision, and hyperexcitability.

People, horses, and birds can become infected from a bite by a mosquito carrying the diseases, but there is no evidence that horses can transmit the virus to other horses, birds, or people through direct contact.

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